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Vermicomposting

Vermicomposting
The use of earthworms in composting process is known as vermicompost­ing. One kg of earthworms can consume one kg of organic materials in a day and excrete as castings that are rich in nitrate, available phosphorus, potassium, calcium and magnesium. The castings encourage growth of bacteria and actinomycetes due to aeration in soil pores.

There are about 3000 species of earthworms in the world and about 500 in India alone. The earthworm is an aerator by making tunnels and by crushing and mixing of soil.

By its enzymatic and biological activity, the earthworms stimulate soil microbiological activity. Vermicomposting began in Ontario, Canada in 1970 and today the USA, Japan and Phillip­pines are leading in vermicomposting both. quantitatively as well as qualitatively.

A moist compost heap of 204m x 1.2m x 0.6m deep can support 50,000 worms. A shallow well drained heap is ideal for worms to feed and mul­tiply. Lumbricus rubellus (the red worm) and Eisenia foetida are thermo­tolerant and can stand the heat generated in the composting process. There are many other suitable species of worms available with breeders which can be had from agricultural universities and centres of agriculture research.

The bedding for multiplying worms comprises of any moistened organic residue such as saw dust, cereal straw, rice husks, bagasse, card board and so on. This bedding material kept in boxes is covered with damp sack and left for 4 weeks followed by the addition of chicken manure, green matter and water hyacinth. The pH must be around 7.0 and temperature about 2D-27°C. The breeder earthworms are allowed to multiply in these boxes, taking care to avoid predators such as birds and frogs.

A series of compost pits of dimensions 3m x 4m x 1m deep are dug with sloping sides.

Bamboo poles are placed at the bottom of the pits and lined with gunny sack to avoid the scape of worms. The pits are filled with moist farm wastes, animal manure and leaves that are well chopped. The worms are picked by hand from the boxes and placed into the pit. By incubating the compost pit in the shade and keeping it moist but not water logged for 2 months, a good organic matter rich vermicom­post can be prepared for use on the farm.

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